1) heating gas 2) underfiring gas 3) underfeed gas a gas used to heat coke ovens, retort settings or other installations in which endothermic reactions take place GRM: n. (1,2,3) Note: according to the type of plant a high CV gas (e.g. coke-oven gas), a low CV gas (e.g. blastfurnace gas) or liquefied petroleum gases are utilised References: SEEcoke drum SEEcoke oven SEEcoke furnace